json - Unity 反序列化为可编写脚本的对象

Question

有谁知道为什么下面的代码会返回错误

ArgumentException: Cannot deserialize JSON to new instances of type 'CatalogueList.'
UnityEngine.JsonUtility.FromJson[CatalogueList]

我的目录列表位于我的 Assets 中，我可以完美地序列化并上传到我的服务器，我正在尝试下载我的文件并使用 json 填充所有字段。

这是代码。

void AddDownloadedItems(string text, CatalogueList list)
{
    CatalogueList inventoryItemList = UnityEditor.AssetDatabase.LoadAssetAtPath("Assets/CatalogueItem.asset", typeof(CatalogueList)) as CatalogueList;
    list = JsonUtility.FromJson<CatalogueList>(text);
}

但正如我所说，它只会返回错误？

目录项列表代码

public class CatalogueList : ScriptableObject { 
    public List<CatalogueItem> itemList;
}

目录项目代码

[System.Serializable]                                                           //  Our Representation of an InventoryItem
public class CatalogueItem
{
    public string databaseID;
    public string itemName = "New Item";
    public enum PrizeMachine { Bronze, Silver, Gold, Platinum };
    public PrizeMachine myMachine;                     
    public Texture2D itemThumb = null;
    public Texture2D itemIcon = null;
    public string itemThumbName;
    public string itemIconName;
    public string shortDescripion;
    public string fullDescription;                                 
    public int priceInBronze;
    public int priceInSilver;
    public int priceInGold;
    public int priceInPlatinum;
}

Answer 1

改用FromJsonOverwrite!

Note that the JSON Serializer API supports MonoBehaviour and ScriptableObject subclasses as well as plain structs/classes. However, when deserializing JSON into subclasses of MonoBehaviour or ScriptableObject, you must use FromJsonOverwrite; FromJson is not supported and will throw an exception.

https://docs.unity3d.com/2022.3/Documentation/ScriptReference/JsonUtility.FromJsonOverwrite.html

所以对你来说就是

JsonUtility.FromJsonOverwrite(text, list);

请注意，这不是一个不可变的方法，并且会覆盖您的对象，但无论如何这似乎都是您的意图。